segment fault

R=rsc OCL=31396 CL=31396

segment fault
R=rsc OCL=31396 CL=31396
5ff7d848 · Ken Thompson · 600d7828 · 5ff7d848
Commit 5ff7d848 authored Jul 09, 2009 by Ken Thompson
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src/cmd/gc/walk.c src/cmd/gc/walk.c +4 -0

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--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -790,6 +790,10 @@ loop:
 		if(top != Erv)
 			goto nottop;
 		walktype(n->left, Erv);
+		if(n->left == N) {
+			yyerror("missing argument to len");
+			goto ret;
+		}
 		defaultlit(n->left, T);
 		implicitstar(&n->left);
 		t = n->left->type;